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Summary of Significant Accounting Policies - Other Investments (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cost method investments - jetblue tech ventures		$ 67	$ 67	$ 40
Recognized gain on investment	$ 17	37	37
Carrying value of investment		$ 36	$ 36
Measurement alternative, ownership percentage		10.00%	10.00%
Cost method investments - TWA flight center hotel		$ 14	$ 14	$ 14

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Cost Method Investments - JetBlue Tech Ventures

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Ownership Interest, Measurement Alternative, Percentage

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Amount of investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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Amount of realized gain (loss) on investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
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